JP3232253U - Grip nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grip nut which prevents an inner nut from falling off and obtains an effect of preventing loosening. An inner nut tapered surface 12 is provided on an outer peripheral surface of an inner nut 10, and the diameter is increased from an inlet side to an outlet side in an insertion direction of a bolt 30 with respect to a screw hole 11. The flange 13 protrudes radially along the radial direction of the inner nut toward the outlet side in the bolt insertion direction with respect to the screw hole. The first detent portion 14 is provided at a predetermined position on the outer peripheral surface of the inner nut and has a concave shape. The outer nut tapered surface 22 is provided on the inner peripheral surface of the through hole 21 and expands in diameter from the inlet side to the outlet side in the bolt insertion direction with respect to the through hole to match the inner nut tapered surface of the inner nut. The mounting groove 23 is radially cut out along the radial direction of the outer nut 20 on the outlet side in the bolt insertion direction with respect to the through hole, and the flange of the inner nut can be mounted. The second detent portion 24 is provided at a predetermined position on the inner peripheral surface of the through hole, has a convex shape, and can match the first detent portion. [Selection diagram] Fig. 1

Description

The present invention relates to a grip nut.

Conventionally, grip nuts (locking nuts) for preventing loosening have been on the market, and there is a grip nut technology that improves the locking effect with a simple structure. For example, Japanese Utility Model Registration No. 3147424 (Patent Document 1) discloses a composite nut 1 including an outer nut 10 and an inner nut 20 housed in the outer nut 10. The outer nut 10 has a tapered inner nut fitting hole 11 having an axially expanded diameter from the inlet side to the outlet side of the bolt and a uniform diameter in the circumferential direction, and the inner nut fitting hole 11 inside. It has a detent portion 13 that protrudes in the direction. Further, the inner nut 20 has an outer peripheral tapered surface 21 whose diameter increases in the axial direction from the inlet side to the outlet side of the bolt and has a uniform diameter in the circumferential direction, and an axial through screw hole 22 into which the bolt is screwed. It has a dividing portion 23 that communicates between the outer peripheral tapered surface 21 and the through screw hole 22 and into which the detent portion 13 is fitted. As a result, the wall thickness of the inner nut 10 becomes substantially uniform in the circumferential direction. Therefore, when the nut 1 is screwed into the bolt B and the inner nut 20 is pulled into the outer nut 10 to reduce the diameter, the degree of diameter reduction is increased. It is said that the nuts 20 become almost even in the circumferential direction, and as a result, the entire circumference of the inner nut 20 holds the bolt B with almost no gap, and a high anti-loosening effect can be obtained. Further, since the inner nut fitting hole 11 of the outer nut 10 and the outer peripheral tapered surface 21 of the inner nut 20 have a simple structure, the composite nut 1 can be easily machined by a machine tool or the like, and the outer nut 10 and the inner nut 20 can be easily machined. It is said that the friction of 20 is small and the screwing into the bolt B can be performed smoothly.

Further, Japanese Patent Application Laid-Open No. 9-210039 (Patent Document 2) describes a receiving metal fitting having a tapered through hole, a shaft hole having a female screw screwed into a bolt, and a tapered outer surface corresponding to the through hole of the receiving metal fitting. A locking nut comprising a tightening metal fitting that is tightly fitted to the receiving metal fitting is disclosed. The through hole of this receiving metal fitting has a small diameter on the head side of the bolt, the base end of the tightening metal fitting is shaped so that a rotating tool can be locked, a slit parallel to the shaft is formed at the end, and the shaft hole of the tightening metal fitting. The peripheral wall is configured to be crimped to the bolt peripheral wall. As a result, when the shaft hole of the tightening bracket is screwed into the bolt and tightened, the tapered outer surface of the tightening bracket is crimped to the tapered surface of the receiving bracket and elastically deformed in the bolt direction. It will be crimped to the bolt and integrated with the bolt, and it is said that a large vibration resistance can be obtained.

Further, in Japanese Patent Application Laid-Open No. 2004-340165 (Patent Document 3), a slit 12 for a missing circle is provided in a thin portion of a conical body 10 having an eccentric through hole 9 slightly larger than the nominal diameter of the bolt 8 and the bolt 8. The diameter of the inner circumference of the vertically installed bush 13 and the half portion not facing the seat surface is made smaller than the diameter of the outer circumference of the tip portion of the bush 13, and the diameter of the opening of the half portion facing the seat surface. Is smaller than the diameter of the outer circumference of the lower part of the bush 13, and the conical hole portion 14 having a tapered portion surface having the same inclination angle as the conical inclination angle of the bush 13 is screwed with the screw portion 8a of the bolt 8 of the female screw portion 15a. A locking fastener made of a nut 15 opened at the bottom is disclosed. As a result, the ability to prevent "return rotation" is extremely enhanced by the so-called pitch loss phenomenon, which consists of strong friction locally concentrated and pitch mismatch due to pressing the nut in an inclined posture against the upper end of the nut.

Further, Japanese Patent Application Laid-Open No. 2010-106878 (Patent Document 4) discloses a locking nut including an inner nut and an outer nut screwed onto a common screw shaft. The inner nut is formed in an annular shape having a screw hole in which the screw shaft is screwed in the center, and the outer peripheral surface of the ring surrounding the screw hole is a conical peripheral surface coaxial with the screw hole. The ring is cut out by a slit provided at one location on the circumference. The outer nut has a screw hole into which the screw shaft is screwed and a recess in which the inner peripheral surface is a conical peripheral surface coaxial with the screw hole and the inner nut is fitted, which is coupled to one opening side of the screw hole. Has. (1) A protruding portion integrally formed on the conical peripheral surface of the inner nut by projecting radially outward from the conical generatrix, and (2) on the conical peripheral surface of the outer nut in the radial direction from the conical generatrix. It includes at least one of the projecting portions, which are integrally formed by projecting toward the direction. As a result, seizure does not occur between the conical peripheral surfaces of the inner nut and the outer nut, so it is easy to loosen or remove after using it for tightening once, and when it is used for tightening again after that, the first time. It is said that it is possible to provide a reusable anti-loosening nut because it can generate a locking force equivalent to that at the time of tightening to reliably prevent loosening.

Utility Model Registration No. 3147424 Japanese Unexamined Patent Publication No. 9-210039 Japanese Unexamined Patent Publication No. 2004-340165 Japanese Unexamined Patent Publication No. 2010-106878

Although there are a wide variety of technologies related to grip nuts, such as the technologies described in Patent Documents 1-4 above, those that are difficult to obtain the effect of preventing loosening, those that easily damage bolts, and grip nuts are separated into two points. Each technology has advantages and disadvantages, such as those that are difficult to work with.

Here, with the two-point grip nut composed of the inner nut and the outer nut, when the bolt is fastened to the grip nut, the inner nut may fall off from the outer nut, and it is difficult to fasten the bolt to the grip nut. There are challenges. In the technique described in Patent Documents 1-4 described above, since the inner nut is separated from the outer nut, the same problem arises.

Therefore, the present invention has been made to solve the problem, and an object of the present invention is to provide a grip nut capable of surely preventing the inner nut from falling off and obtaining an effect of preventing loosening.

The grip nut according to the present invention includes an inner nut and an outer nut. The inner nut includes a screw hole, an inner nut tapered surface, a flange, and a first detent portion. A screw hole is provided in the center of the inner nut along the axial direction of the inner nut. The inner nut tapered surface is provided on the outer peripheral surface of the inner nut, and the diameter increases from the inlet side to the outlet side in the bolt insertion direction with respect to the screw hole. The flange projects radially along the radial direction of the inner nut toward the outlet side of the screw hole in the insertion direction of the bolt. The first detent portion is provided at a predetermined position on the outer peripheral surface of the inner nut, and is concave or convex.

Further, the outer nut includes a through hole, an outer nut tapered surface, a mounting groove portion, and a second detent portion. A through hole is provided in the center of the outer nut along the axial direction of the outer nut, and the inner nut can be stored. The outer nut tapered surface is provided on the inner peripheral surface of the through hole, expands in diameter from the inlet side to the outlet side in the insertion direction of the bolt with respect to the through hole, and matches the inner nut tapered surface of the inner nut. .. The mounting groove is cut out radially along the radial direction of the outer nut on the outlet side of the bolt in the insertion direction with respect to the through hole, and the flange of the inner nut can be mounted. The second detent portion is provided at a predetermined position on the inner peripheral surface of the through hole, is convex or concave, and can match the first detent portion.

According to the present invention, it is possible to surely prevent the inner nut from falling off and to obtain the effect of preventing loosening.

It is a developed view, the cross-sectional view of line AA, the cross-sectional view of line BB, and the cross-sectional view of line CC according to the embodiment of the present invention. It is a sectional view taken along line BB and a sectional view taken along line CC when the grip nut according to the embodiment of the present invention is bolted. A development view (FIG. 3A) when the design of the grip nut flange and the mounting groove according to the embodiment of the present invention is changed, and a development view (FIG. 3B) when the design of the inner nut taper surface and the outer nut taper surface is changed. ) And. It is a development view (FIG. 4A) and the cross-sectional view (FIG. 4B) in the case where the flange of the grip nut and the mounting groove portion according to the embodiment of the present invention are redesigned by fitting. FIG. 5A is a cross-sectional view (FIG. 5A) when the mounting groove portion of the grip nut according to the embodiment of the present invention is redesigned, and FIG. 5B is a cross-sectional view when a ring is added to the mounting groove portion. It is a photograph of the inner nut of the grip nut according to the embodiment of the present invention. It is a photograph of the inner nut and the outer nut of the grip nut according to the embodiment of the present invention. It is a photograph of the case where the inner nut of the grip nut according to the embodiment of the present invention is attached to the outer nut.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to help understand the present invention. It should be noted that the following embodiment is an example embodying the present invention and does not limit the technical scope of the present invention.

As shown in FIG. 1, the grip nut 1 (composite nut, loosening prevention nut) according to the present invention includes an inner nut 10 and an outer nut 20.

Here, the inner nut 10 includes a screw hole 11, an inner nut tapered surface 12, a flange 13, and a first detent portion 14.

The screw hole 11 is provided in the center of the inner nut 10 along the axial direction of the inner nut 10. The inner nut tapered surface 12 is provided on the outer peripheral surface of the inner nut 10, and the diameter increases from the inlet side to the outlet side in the insertion direction of the bolt 30 with respect to the screw hole 11. The flange 13 protrudes radially along the radial direction of the inner nut 10 toward the outlet side of the screw hole 11 in the insertion direction of the bolt 30. The first detent portion 14 is provided at a predetermined position on the outer peripheral surface of the inner nut 10 and has a concave shape.

In FIG. 1, the inner nut tapered surface 12 is configured as an outer peripheral surface of a cone. The flange 13 is circular in a plan view. The first detent portion 14 is configured as a dividing portion 14a that is divided along the axial direction of the inner nut 10 from a predetermined position of the inner nut 10.

Further, the outer nut 20 includes a through hole 21, an outer nut tapered surface 22, a mounting groove portion 23, and a second detent portion 24.

The through hole 21 is provided in the center of the outer nut 20 along the axial direction of the outer nut 20, and the inner nut 10 can be stored. The outer nut tapered surface 22 is provided on the inner peripheral surface of the through hole 20 and expands in diameter from the inlet side to the outlet side in the insertion direction of the bolt 30 with respect to the through hole 20 to meet the inner nut tapered surface 12 of the inner nut 10. Match. The mounting groove 23 is radially cut out along the radial direction of the outer nut 20 on the outlet side of the bolt 30 with respect to the through hole 20 in the insertion direction, and the flange 13 of the inner nut 10 can be mounted. The second detent portion 24 is provided at a predetermined position on the inner peripheral surface of the through hole 21, has a convex shape, and can match the first detent portion 14.

In FIG. 1, the outer nut tapered surface 22 is configured as an outer peripheral surface of a cone, similarly to the inner nut tapered surface 12. The mounting groove portion 23 is U-shaped with respect to the radial direction of the outer nut 20 in a cross-sectional view, and constitutes an annular groove in a plan view. The second detent portion 24 is a through small hole 24a provided along the axial direction of the outer nut 20 in the vicinity of the through hole 21 of the outer nut 20, and a pipe inserted into the through small hole 24a and fixed. When the pipe body 24b is inserted into the small through hole 24a, a part of the pipe body 24b protrudes from the inner peripheral surface of the through hole 21 toward the center of the first detent portion 14. It is configured to be hooked on the dividing portion 14a.

As a result, it is possible to surely prevent the inner nut from falling off and to obtain the effect of preventing loosening.

That is, the inner nut 10 is fixed to the outer nut 20 by accommodating the inner nut 10 in the through hole 21 of the outer nut 20 and mounting the flange 13 of the inner nut 10 in the mounting groove portion 23 of the outer nut 20. .. That is, the flange 13 of the inner nut 10 is fitted into the mounting groove portion 23 of the outer nut 20. Therefore, the inner nut 10 can be configured as an integral part of the outer nut 20, and the bolt 30 can be fastened in the same manner as a general nut. Further, by mounting the flange 13 of the inner nut 10 in the mounting groove portion 23 of the outer nut 20, it is possible to reliably prevent the inner nut 10 from falling off from the outer nut 20.

Here, by aligning the dividing portion 14a of the first detent portion 14 of the inner nut 10 with the pipe body 24b of the second detent portion 24 of the outer nut 20, the pipe body of the second detent portion 24 The 24b fits in the dividing portion 14a of the first detent portion 14 to prevent the inner nut 10 from idling with respect to the outer nut 20.

Then, as shown in FIG. 2, the bolt 30 is inserted into the through hole 41 of the object 40, the screw hole 11 of the inner nut 10 housed in the outer nut 20 is aligned with the screw thread 31 of the bolt 30, and the tool is used. When the bolt 30 is rotated by using the above, the first detent portion 14 of the inner nut 10 matches the second detent portion 24 of the outer nut 20 when the bolt 30 is fastened, and the inner nut 10 Is stopped, and the tightening stress (torque) of the bolt 30 is transmitted to the inner nut 10. Then, at the same time that the inner nut 10 is pulled into the depth of the through hole 21 of the outer nut 20, the inner nut 10 contracts toward the axial center.

Here, the inner nut tapered surface 12 of the inner nut 10 matches the outer nut tapered surface 22 of the outer nut 20, and the inner nut 10 contracts evenly in the entire circumferential direction. Therefore, the inner nut 10 is screwed with the bolt 30 while gripping the bolt 30 as a whole while relaxing the concentration of tightening stress, so that a high anti-loosening effect can be obtained.

Further, when the screw hole 11 of the inner nut 10 contracts toward the axial center when the bolt 30 is fastened, the dividing portion 14a is divided along the axial direction of the inner nut 10 from a predetermined position of the inner nut 10. Therefore, the screw hole 11 can be made to act so as to firmly embrace the screw thread 31 of the bolt 30 in response to the contraction of the screw hole 11. Therefore, in this case, the dividing portion 14a has both a function as the first detent portion 14 and a function of tightening the screw hole 11 to the screw thread 31.

Normally, bolts and nuts always have dimensional tolerances. This creates a certain gap between the threads of the bolt, so it is necessary to prevent the threads of the bolt from burning into the screw holes of the nut when the bolt is fastened to the nut. On the other hand, when a stainless bolt or nut is tightened with a tool such as an electric motor, heat due to friction is generated between the screw thread of the bolt and the screw hole of the nut, and the heat expands the screw thread and the screw hole, causing the screw. The ridge and the screw hole are in close contact and do not move. This state is called galling (burning). Due to the occurrence of this galling, loosening of the screw may occur due to the gap of the screw thread after the bolt is fastened. In the present invention, the inner nut 10 is integrated with the outer nut 20 to prevent the inner nut 10 from falling off, and the inner nut tapered surface 12 of the inner nut 10 is aligned with the outer nut tapered surface 22 of the outer nut 20. , The screw hole 11 of the inner nut 10 is screwed into the screw thread 31 of the bolt 30. As a result, the screw fastening work can be smoothly performed in the same manner as a general nut, and the occurrence of galling can be suppressed.

Here, in FIG. 1, the flange 13 is made circular in a plan view, and the mounting groove portion 23 is formed as an annular groove in a plan view. However, the present invention is not limited to this, and for example, the flange 13 is formed in a plan view. The shape may be an equilateral triangle, a regular quadrangle, a regular hexagon, a regular decagon, a regular polygon, a cross shape, a gear shape, or the like, and the mounting groove portion 23 may be formed into a groove having a shape corresponding to the shape of the flange 13. I do not care.

Further, in FIG. 1, the flange 13 has a U-shaped square shape in a cross-sectional view, and the mounting groove portion 23 has a U-shaped groove shape in a cross-sectional view. The flange 13 has a U-shaped round shape in a cross-sectional view, and the mounting groove portion 23 has a U-shaped groove shape in a cross-sectional view.

Further, as shown in FIG. 3A, the flange 13 may be provided with serrations (sawtooth shape), and the mounting groove portion 23 also has a shape corresponding to the serrations of the flange 13. Here, since the flange 13 matches the mounting groove portion 23, the flange 13 functions as the convex first detent portion 14, and the mounting groove portion 23 functions as the concave second detent portion 24. Then, as shown in FIG. 1, the small through hole 24a and the pipe body 24b become unnecessary. For example, when the inner nut 10 contracts toward the axis, the dividing portion 14a can perform the above-mentioned tightening function in order to appropriately contract the inner nut 10.

On the other hand, as described above, when the first detent portion 24 and the second detent portion 24 are configured as separate bodies with respect to the flange 13 and the mounting groove portion 23, the divided portion of the first detent portion 14 The configuration of the through small hole 24a of the 14a and the second detent portion 24 and the pipe body 24b is not particularly limited. When the shape of the divided portion 14a is changed, the configuration and shape of the through small hole 24a and the pipe body 24b may be appropriately changed according to the shape of the divided portion 14a.

Further, in FIG. 1, the inner nut tapered surface 12 and the outer nut tapered surface 22 correspond to the outer peripheral surface of the cone, but the present invention is not limited to this. For example, as shown in FIG. 3B, the inner nut The tapered surface 12 and the outer nut tapered surface 22 may correspond to the outer peripheral surface of a polygonal pyramid such as a hexagonal pyramid. In this case, since the corner portion existing on the outer peripheral surface of the polygonal pyramid of the inner nut tapered surface 12 matches the corner portion existing on the inner peripheral surface of the polygonal pyramid of the outer nut tapered surface 22, the inner nut tapered surface 12 is formed. , It functions as a convex first detent portion 14, and the outer nut tapered surface 22 functions as a concave second detent portion 24. Then, as shown in FIG. 1, the small through hole 24a and the pipe body 24b become unnecessary.

Further, as shown in FIG. 4A, the flange 13 is provided with four convex protrusions radially in addition to the dividing portion 14a, and the four protrusions are configured as the first detent portion 14b. The mounting groove portion 23 may be provided with four concave recesses 24 in which the first detent portion 14b can be fitted in a radial pattern. As a result, as shown in FIG. 4B, the flange 13 of the inner nut 10 is mounted in the mounting groove 23 of the outer nut 20, and the protrusion 14b of the flange 13 is fitted into the recess 24 of the mounting groove 23, so that the protrusion 14b is recessed. In order to match 24, the protrusion 14b functions as a convex first detent portion 14, and the recess 24 functions as a concave second detent portion 24. Then, as shown in FIG. 1, the small through hole 24a and the pipe body 24b become unnecessary. The dividing portion 14a is provided to perform the above-mentioned tightening function.

By the way, in FIG. 1, since the mounting groove portion 23 is U-shaped with respect to the radial direction of the outer nut 20 in a cross-sectional view and constitutes an annular groove in a plan view, it is a U in a plan view. A wall surface is provided on the upper surface of the character. Since such a groove configuration may be difficult to process, for example, as shown in FIG. 5A, the mounting groove portion 23 has an outer nut 20 on the outlet side in the insertion direction of the bolt 30 with respect to the through hole 20. Radially cut out from the upper surface (flat surface) along the radial direction of the outer nut 20. In cross-sectional view, it is L-shaped with respect to the radial direction of the outer nut 20, and in plan view, an annular step portion 23a. , And an annular protruding portion 23b (brimmed portion) provided so as to extend to the upper surface of the outer nut 20 may be formed outside the step portion 23a. In this case, the flange 13 of the inner nut 10 is attached to the stepped portion 23a of the outer nut 20, and then the protruding portion 23b is bent toward the flange 13 and crimped so that the stepped portion 23a and the protruding portion 23b are separated from each other. Since the outer nut 20 has a U-shape in the radial direction in the cross-sectional view, the outer nut 20 functions as a fall prevention of the inner nut 10, and the inner nut 10 and the outer nut 20 are combined with the grip nut 1. Can be integrated as.

Further, the mounting groove portion 23 may be further provided with an annular ring 23c. In this case, for example, as shown in FIG. 5B, the flange 13 of the inner nut 10 is attached to the stepped portion 23a of the outer nut 20, then the ring 23c is installed on the upper surface of the flange 13, and then the protruding portion 23b. Is bent toward the ring 23c. As a result, similarly to the above, the outer nut 20 can function as a fall prevention of the inner nut 10, and the inner nut 10 and the outer nut 20 can be integrated as the grip nut 1. The configuration of the ring 23c is not particularly limited, and examples thereof include a spring ring and a double ring.

Further, the outer nut 20 may further be provided with a stopper 25 extending inward along the radial direction of the outer nut 20 on the inlet side in the insertion direction of the bolt 30 with respect to the through hole 20. As a result, even if the inner nut 10 is excessively fitted inside the through hole 21 of the outer nut 20, the stopper 25 comes into contact with the lower surface of the inner nut 10 and stops the fitting of the inner nut 10. As a result, it is possible to prevent the inner nut 10 from being excessively contracted and the bolt 30 being tightened excessively.

By the way, as an example, based on FIG. 1, as shown in FIG. 6-8, the grip nut 1 according to the present invention was prepared. In the created grip nut 1, since the inner nut 10 and the outer nut 20 are integrated as the grip nut 1, the inner nut 10 can be reliably prevented from falling off from the outer nut 20. Further, when the screw thread 31 of the bolt 30 was screwed into the screw hole 11 of the inner nut 10, the effect of preventing loosening could be obtained.

Further, in the embodiment of the present invention, other functions and other designs may be added to the configuration of the grip nut 1.

As described above, the present invention is useful as a grip nut, and is effective as a grip nut capable of surely preventing the inner nut from falling off and obtaining an effect of preventing loosening.

1 Grip nut 10 Inner nut 11 Screw hole 12 Inner nut Tapered surface 13 Flange 14 First detent part 20 Outer nut 21 Through hole 22 Outer nut Tapered surface 23 Mounting groove 24 Second detent part

Claims (1)

A grip nut with an inner nut and an outer nut.
The inner nut is
A screw hole provided in the center of the inner nut along the axial direction of the inner nut,
An inner nut taper surface provided on the outer peripheral surface of the inner nut and whose diameter increases from the inlet side to the outlet side in the bolt insertion direction with respect to the screw hole.
A flange that protrudes radially along the radial direction of the inner nut on the outlet side of the bolt in the insertion direction with respect to the screw hole.
A first detent portion provided at a predetermined position on the outer peripheral surface of the inner nut and having a concave or convex shape is provided.
The outer nut is
A through hole provided in the center of the outer nut along the axial direction of the outer nut and capable of accommodating the inner nut.
An outer nut taper surface provided on the inner peripheral surface of the through hole, whose diameter increases from the inlet side to the outlet side in the insertion direction of the bolt with respect to the through hole, and which matches the inner nut taper surface of the inner nut.
A mounting groove portion that is radially cut out along the radial direction of the outer nut and on which the flange of the inner nut can be mounted is provided on the outlet side of the through hole in the insertion direction of the bolt.
A second detent portion provided at a predetermined position on the inner peripheral surface of the through hole, which is convex or concave and can be matched with the first detent portion.
To prepare
Grip nut.

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